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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cc8420e5a6e8056965ae3235d23972b9e8062651285270d82472c395db3b0a6' 
  AND token = 'SUXY1St/eQCv+lb3ZBpIHD5vN6K4Ruv935Vn+dmIDsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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