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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be8db55fe6ecc9ee6985131021d772873682896e2d7b7aeab9d1eea83794d711' 
  AND token = '236lw1+c7VKdVkTxIUbD04XpjHYDCHCBjWdGTuKgJ0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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