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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a503b3dac65b602715eb3cf464d0c7c0028c637ce88d682edcfa0efb958dd8bf' 
  AND token = 'nuOTQCN1q6gYHECgpCsU/T08e+tNI1MiZ4nhsnbtloE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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