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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696401c765e812a752c693466199247e0386552180e46b70eaf9062f82886d25' 
  AND token = 'YRbaWfgDzWpYhi3bpbuRUdaboqdz9bf9QRYIg71bmKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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