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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d7f05f97976a1ca87bfec0fe8ce1d77f8ee00c038da160d2d5ec99ccd64d13' 
  AND token = 'HbzsnZwEU0K6UOgiIEEcWuYG73k+fo8qC2JF5raNLBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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