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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b1568d48fd6258b4c5932830691205041c14f15c44c43a7f2f4b85565e785d' 
  AND token = 'yLiAwWqmAGzTg2FlWU57xgx5bUpigCgUeG9ZRVAMAMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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