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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '494056c36c6035d7288966f0c7ecd7336b067463cf2bd503a638e4dab0c7aba5' 
  AND token = 'p2Y4vHEZg2F8sJxecsXygEvj5AabiNJWW+gNx6Gk8YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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