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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bde2af74e0350b57efb5d7a57907c555e0f61950a7defa8c59108b5eb4df3012' 
  AND token = 'pEeLbbbvfjT9HMX77cNFAGbcDEdpqwwY7h33lACXcf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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