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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb407d3e5bb6ca965fe389de482656d8a4704383472bc4cfe1262bc864d4a85c' 
  AND token = 'ZXw1paPu8KpGFuJJzNDQn0dGJzyk69fkOcgEmPuGRgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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