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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2d01858398eddad9bf2ff78a039a8866808beaa0e25f5363b616b9b8d66ea10' 
  AND token = 'xUhYI7ViH1sCqhc3NZ2TuIXd3gwtNOL5ZCmJOAAKI5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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