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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba7c9d231655a08447f553f8078b664fffb29f3caf3bb97b88cf51352433045' 
  AND token = '82PAc4+39A/2cG8hO2w2yCQtiZMcxNQ6yoHS4/mu6QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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