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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3da2f8ca451f4f7bf7b71156337237f401f06ece57d66c9d1178ac6d4e6b9d1' 
  AND token = '5ooL0ra1JcW/pO6C08tlgN6ymYurSelEvJS/MMSBPaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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