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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68251f2eb3b8f671fbd4d34f59c1bba17ce571d81cdb00503ddc79be39fe711e' 
  AND token = 'n+33s3ZlysZAAJGkb8AKbB/IGMqKm+4RkJzq7l46ldc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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