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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90b89c28e389ca1e51395420148830697e322350c43cfd861ffa8cc48992f4c8' 
  AND token = '2Gc2pZhjl5In2D20UJll00rF8ev8xzTBjZ8pLxW1IgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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