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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ade6bff09d6cd20f2d89b19b8c6afb6bcc1a44bbb5f4fec5e1c472df24d03e51' 
  AND token = 'qBsGvE6G+E+nyXLVfDxi+ISPh/gkW7bIbFSMWhmwcWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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