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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26ea6d042f4109db6e09303a8700a2e7ab20e0543b0369c2df5612c1e5ad4e88' 
  AND token = '0UAM76/zH8Izhi2ttRr4QC7v6HwKiRtzwXu4agHGk4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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