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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb1a109b50995301826c12dc6320aec103989a5a5d0ab9e22f571a7eb4d97987' 
  AND token = 'c/C2+d5sdM5f/QSZPCxTQW1LC/LICBbTXdANBCEXzeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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