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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99335cfd18f4b2e4a4467f8467b0eb4174c1a75a0e27ae9afcc9ee7bd67375f1' 
  AND token = 'VfR0fMMoMJMlwyXWUkuFrRN2V/mUJIoTTfRnITt7Fsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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