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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bfd2dd8b099844c80467f40b934e25f5cf4e20dc6789f3d66e08fb8035679be' 
  AND token = 'vUNfehM7mikW5eYfu9w5QwyPozvEamUMFZ9wxaYICVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00122

JSON explain

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