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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4742bf86d89b0569a0f3900766e7c5f59e47862648450d783cec20270065e55' 
  AND token = '3gOaXwYvK0ZLxn4tUdbq1SFu02mpJ03RpGijYzr8MFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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