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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fffc8606c2f8f6b706b2aebd0b0e2a47771d78a0cd05ab377399b1114880e761' 
  AND token = '94OGS+4o6eoI2Vok/WLQcT7xShUuPiyLQd/ylr8Rnb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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