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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6d2d31b8ff7360e661d673b17aebb24fc3e4884814ab30ce3a99097501901c7' 
  AND token = 'Io50Z5MpDfL86tw9myt7wHW9vP33afdRX0xAKBCMwdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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