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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '839f0c18e83e3f085d50d38e14fb67ca998436a0fa780589490b69db2bcf0e29' 
  AND token = 'Si5o8N5Mjq25FWTocCHmTTf71hGs0mMJCzJ8NU1Gn+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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