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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8349ec8f8112331b4555fb8c14da151394d4d322609cc568492657410dc6c046' 
  AND token = 'sdVu6nra7ijuXCWt7eNLMz+8TPjjrl1yI72UDKH2vog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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