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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f9b4a3b5bf58adf1dbd01112d4f8e83d262ef5db8ddb2ce5654d82d1df9bf95' 
  AND token = '9bEsDWrs0a1ZjKMtMpNb9QHdgVnKEg3Eq5GRhr4ltjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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