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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f36821387ede425961f820aac55569e8e72352b9ca4c64b7e3562243c4ec97ef' 
  AND token = 'kiSxb84H6CmBPxf9Cwg252qqw9zwUhKLc2Dp/L/6g9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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