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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f736210837710677b220c519ba19018d997e08672e132323d4bb96d11db570' 
  AND token = '/V6aGymxfyKhsDMOYkFOUS4vEDsX7qm5ipnR4hnjSZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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