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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4cc6d26ce7d9231039fb9fe6427569b5e65f6109d72dfab1c02c1bce4193eeb' 
  AND token = '6YMyuRFEnwi5A6tX8uj5ZRE963LZeWsm8yODdZTuD7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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