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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf840c5edde2e5f698c0e8ee7a979f192212f7c7143ad0c1cc67f6f71c63465' 
  AND token = '//njEyhtQZdz8sZZdKI9EEjKKyVTePzEyCcul5xprdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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