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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fa7f34cf8779d87960659764033c0286bc57bf8c3a88860a23ae412c7c94fbe' 
  AND token = 'bH6e10jDKL/7AHCaVEl/fJbrHnwcAASRNiP5/tn92qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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