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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aea4be69f953ce003a00ad66587b9620156dcc1824050b59c2d3cf53a8ee86b' 
  AND token = 'vFh9/94M86xTvikdkaxZUAe3bKuyk5V+T1j5OW5txKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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