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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92baf95ebf29c4362ea30d4228a68028889ffc78b0b5702dc7c75ff520984590' 
  AND token = '0Ly7oulWjNjl8iE+s4dlzC5ZzFc8SEOEgNBXYSgd8bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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