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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '054d4918c88d0f064aa76a5daf2db475a7fc8a1b0c7d0d9f04776fcd13b94738' 
  AND token = '/mG3qcQRiHPbmwIf0i/ef/rcoe2h2BRGxO48qcDHcPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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