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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '568a955c766d16c28acfe9f24dc7c7a0d1584da531ba0315aac0680ba0059446' 
  AND token = 'qC9zFIv0hEXFxExmsDpjGaHtNZ7MXK58lr7yOtysTYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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