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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a0eb1a5ad8f2a3513edcc8ad6dca704af6471c9e2fe7a5af46a8ab7d9aa83c8' 
  AND token = 'zCpM7azA2P1DjCzIZJgT9DIYMgFg5yQB3nN/FJqRTfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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