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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20858f8bf14d43423915200c958d8378c75c633eeb0ecddf2606aa195ebecec2' 
  AND token = 'gxDwQjdBdlfv8uW03M08XJSV69jr21ocnQTySkf4zSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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