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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d0ed74ca11a24f6a6ad72eda4bfe42c10e1b5021b69a7e3bbf6f02e16e10e87' 
  AND token = 'iro5MmtYjfCw2rytzbH+ThM88mTGis3OTRY1clMwjzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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