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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14f9d3e290995e981f525d0267a73910995f8aad0647db887425a832c0cd3d85' 
  AND token = 'BehZXn+yn8NVAJhha672L3m1BOqaqXQ53iAvSSBSNL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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