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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc277c91c1d19e06464ec60fad9f66aad8c81b6955d954347a767a715f26d207' 
  AND token = '6BkvFeFjiHrwIVjIptXYm5ovLpno5c2ZFxOkc0Yl5V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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