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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03f76f4d5ad6640d0fa5e2837beff12b6166eef003918a7490dd935ff105ed5c' 
  AND token = 'nbF5G+7gDUQN1ZFxe3myFs835LW/izfVQ6ZLmxG/AJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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