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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b88aabeabc9e9cd43cb1d7444bc82193b4324dcc32f48b8018456fa66589be51' 
  AND token = 'oYFBdWnH8ppK8APhEDn3mfJsoNBkY3Qj4lnBrp+dtOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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