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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6985be5960052fc0137d6e5520c08b9c16de2e5e592b52182af95488a986de19' 
  AND token = '+NV1dHkExAs9bLv5kZhn8mcqUET1bLW6wh3JY6fU4mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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