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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a4afdf930b6e40d4f286c15a5046cd464473710e66fb3c2e5151dc1c4db340c' 
  AND token = 'QMCd0BXFpBvBovN4SUdCmU0GOfh7S+ldZtLWmwi+yOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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