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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6741d9f9e52f3a38a8dece11ce61d0d8f02019ddbdf65d8f2f26d8df0d5a0aed' 
  AND token = 'dC9/DRe8h5xJNtYtMNd6ImVpSWjMP7qp/LWCBz620+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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