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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1a88211dd6f86f45554fb3ab6e99170a6d83ecf85330047bc477f7d04bf39e6' 
  AND token = '/HmQi7DCq8p4dHfNOaRjZaaS2dSKRXegnYtl4CBNbHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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