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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2f7645242a9e8a7626084a0f1a57f9bf8af8553dd6d504e57b9db40dfa4937c' 
  AND token = '/93rWDMmXxZPmPZzcw0rRXy43bcGpmxvMe7WxlYqKTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00174

JSON explain

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