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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee1e9ca2997fd0cc6ba0218e8c1dfe19fa8a71af864899cfe41fbe5c4ef34da9' 
  AND token = 'RQhPLV6469W59HOejK+K7ZI36pyPRROY3nZdsqO56bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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