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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e71b1db4f47833ea55040860a8b529f301374f0f68e414a7cbf1cb63f4815608' 
  AND token = '/0iw2JXxvNUgY51AH50alAhu7cIL46jV253NYiUrWdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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