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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d03da1f0ef013b7c650af5ee5fa61725c856a957c69f02764172542d429cdfc' 
  AND token = 'fLzVypTHl77NlBtNRPBlZc0F+bov3Sc5lRtY/rYwZQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}