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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25603acfc7dc85af81fedc279684c0a2fd28e3e2b0d51d96acb8d9a4668d1741' 
  AND token = 'kDsyp2JHYGVYz/BeaHChVUHAxWb4SjMkI2APenSNDVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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