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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '061bc3a2f8e472d02122a224c00cb89afd10b8370111de351d57568c6e470bfa' 
  AND token = 'gZC0OPDmbiL9gFGg1P1+oygYYLqHKEAo2sMxM0PTA5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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