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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '058f621c73c12cdfaad4a492f8f4d256fc3cd30a34e5126873606c171bcc6150' 
  AND token = 'SZk+jiPhib8LB2/Xhy2x8ux4iEg9kXAqxEG3p8K+Ue4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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