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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94fad5e1d259db20ef19eabecee1a09a3c04bb24f151d97f73385ba28733beef' 
  AND token = 'ClpbswwDahY5vwakNzITlG+zSi2sCrWWJrJfUfAmVWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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