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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5a7cd6c13d83cbd5c0a9e3c8b7b88d37ffbd012619b327af79679356fdaa869' 
  AND token = 'nrdYlO4rRrt/Zo/fv6/tCqhHs9JFrk776AzbjoA+IA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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