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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9af0519dd7b9478d2a2b0b1de7709c44496b9e43a24ccdfadde78f2bcf1e3ac2' 
  AND token = 'flMGLSQRyshnsMa6YaRZU/DtmmtaoCSD8sUKL4FkinA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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