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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56ca16e2937097c8fc3807be5f43f3ddabb964ff12ee99ea57efef9038cae866' 
  AND token = 'wLc6duaQ4nF0VOMlrD5yymMHOEfWI5yJgsfoA+5aKNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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