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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e04595c7d632efb18a0c0e5fff46172a1894d70e0ec2231440b2ebb6e4629ff7' 
  AND token = 'GcQLIBERhY9To7zUQGe8w9SE2ObQv4PKWwBRzC/utuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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