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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b3e811bf175279212e386e56474a19fbcf4aae98c2ac47841d0646a0b74fe1e' 
  AND token = 'Dd8j5b3h1Z3Xe5AbLIOs5n75jdhFg9M4FDFoSVdJSPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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