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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbbe07dbbd7abf42718d1b8aab8ee8c00d21ef8804c4a08830c52d5a1b0ebf10' 
  AND token = 'Z1ivWEgtYcGt0fgaSN8f8tEfxMssU+utOOpxZxh8acA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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