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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '656a24e7316f1ce96f996569930f67aeb551520192a9bb10ddf1595bc6840a75' 
  AND token = 'geLOeD2MO6Rsdfct3Ucq7Tj+AeiE7vgteZQbQk7+IdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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