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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f5250f5c35cf0769fc86b28ac0649c2965f3628b6a1c6ce911da02e467e7992' 
  AND token = 'Syw3xKhBFPtx/NW48MUv/Balh4TclqGwfSiAmtzd6fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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