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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ca275fcacaf4a43028a2eb153fe0b878e24d2f50b0d5e54c84f7ed9e3ce2b6b' 
  AND token = 'WaAN9c62J10Sj0ku0iQBol2UHDv/+NJK//sVS9ly4UI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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