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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb7446b86dbc805fa7320e44b04dd8bd61cb4d44a9d28f870a0b9ed05877668e' 
  AND token = 'QAqHuLftG3fq26ih+lyjtS4OyMTVKnn6N4eegggxY2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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